scrolling text input? for pic18f4520 with 2x16 lcd

[Demon]

Might want to compare cursor position with 0,1,2 and 3 when checking the buttons instead of only 0 and 1 no?

Can you even use cursor position 0? Or does it start at 1?

I think you have them backwards, the units would be at position 3, tens at position 2 and so on.

But yeah, that's a perfect starting point to start building on.

Robert

[Art]

Might want to compare cursor position with 0,1,2 and 3 when checking the buttons instead of only 0 and 1 no?

Can you even use cursor position 0? Or does it start at 1?

I think you have them backwards, the units would be at position 3, tens at position 2 and so on.

But yeah, that's a perfect starting point to start building on.

Robert

Whoops, ... copy & paste & forgot to adjust

IF downbutton = 1 THEN
IF cursorposition = 0 THEN
value = value - 1
ENDIF
IF cursorposition = 1 THEN
value = value - 10
ENDIF
IF cursorposition = 2 THEN
value = value - 100
ENDIF
IF cursorposition = 3 THEN
value = value - 1000
ENDIF

and do the same with te up button.
Also need a pause for button debounce, so

pause 500

straight after each button check
cursorposition = 0 is the thousands position.
The thousands digit is the first to be printed to LCD,
so no movement needs to occur from cursor home command.

[Art]

And the other thing you mentioned...
I need to build a generic test circuit before posting code

[Demon]

Just to be sure, I wasn't being sarcastic.

I wanted to post an attempt, but it's easier for me to pick at others.

Robert

[Art]

Just to be sure, I wasn't being sarcastic.

I wanted to post an attempt, but it's easier for me to pick at others.

Robert

Not taken that way at all... good catches

[alamakazam]

guys

I manage to get the lcd working with the cursor responding to the left right navigation button

now , I have a problem with the change of letter

lets say if I want the 1st letter to be from 0,1,2,3,..,9,A,B,C

I am thinking of 012345679ABC as a string, then move from bit to bit

or should I get an array of 13, then point to it

[Demon]

This is totally off the top of my head, no code:

Use an array with 1 element for each character on display.
- if 4 characters, then use 4 elements starting at 0.

Store the position of each character in the array.
- character 1 starts at 0 on startup, so array(0)=1.

Use a lookup table to display each character.

Lcdout (clear screen)
For element = 0 To 3 (if using 4 characters)
Lookup array(element),[0,1,2,3,4,5,6,7,8,9,A,B,C],byteout
Lcdout byteout at next position on display
Next element

-syntax must be corrected.
- never used lookup so not sure if it starts at 0 or 1.
- I remember concatenating characters on the same LCD line, somewhere.

Ok Art, now it's your turn.

Robert